[jira] [Updated] (ARROW-3212) [C++] Create deterministic IPC metadata

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-3212?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated ARROW-3212:
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    Labels: pull-request-available  (was: )

> [C++] Create deterministic IPC metadata
> ---------------------------------------
>
>                 Key: ARROW-3212
>                 URL: https://issues.apache.org/jira/browse/ARROW-3212
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Wes McKinney
>            Assignee: Wes McKinney
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 0.11.0
>
>
> Currently, the amount of padding bytes written after the IPC metadata header depends on the current position of the {{OutputStream}} passed. So if the message begins on an unaligned (not multiple of 8) offset, then the content of the metadata will be different than if it did. This seems like a leaky abstraction -- aligning the stream should probably be handled separately from writing the IPC protocol.



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